Rice ground up to fine flour, sugar, and starch from potatoes? Very high glycemic index I should think. If that doesn't worry you, why not? But a baked potato, or a handful of boiled rice, would probably be less fuss.

What "all natural vanilla flavour" means is anyone's guess. I don't suppose the mix has seen a vanilla pod. "Natural flavor" isn't, as far as I know, a term controlled at law and often means monosodium glutamate, which is a neurotoxin. That would give me pause for thought, but I guess everything else there is OK -- just very high GI.